Inelastic Relaxation Processes in thin Superconducting NbN Films & in 2D Electron...

9313920 Yngvesson莫斯科国立师范大学（MSPU）和阿默斯特的马萨诸塞州大学（UM/A）的研究人员正在进行一项联合研究项目。 在过去的几年中，这两个小组分别开发了热电子器件，这些器件有可能实现新一代的接收器和探测器，其范围为0.5-3 THz（波长为600 μ m至100 μ m），噪声温度比任何现有的接收器都低得多。 MSPU专注于薄膜超导体，而UM/A则在半导体异质结中利用二维电子气（2DEG）介质。 这两种设备的基本原理非常相似：产生由准粒子（在超导体的情况下）或2DEG电子组成的加热介质，在其中进行检测或混合。 这两个机构最近的工作已经产生了可用带宽，演示GHz范围。MSPU已经表明，他们的设备混合到至少1.5太赫兹。 本文对两种介质中的非弹性弛豫过程进行了比较研究，从而扩展了非弹性弛豫过程的基本知识，并介绍了最佳热电子基太赫兹混频器的研制。 目前已知的两种最有前途的材料，NbN薄膜和GaAs/A1 GaAs异质结构的2DEG，已被挑选出来进行具体的比较。 ***

9313920 Yngvesson A joint research project is undertaken between researchers at Moscow State Pedagogical University (MSPU), and University of Massachusetts at Amherst (UM/A). The two groups have during the last few years separately developed hot electron devices which have the potential for realizing a new generation of receivers and detectors for the range 0.5-3 THz (wavelengths 600 um to 100 um), with much lower noise temperature than any present receiver. MSPU has concentrated on thin film superconductors, while UM/A has utilized the two-dimensional electron gas (2DEG) medium at a semiconductor hetero-junction. The basic principles of the two devices are quite similar: a heated medium consisting of quasi-particles (in the superconductor case), or 2DEG electrons, is created, in which detection or mixing takes place. Recent work at both institution has resulted in available bandwidth with demonstrations GHz range. MSPU has shown that their devices mix up to at least 1.5 THz. A comparative study of inelastic relaxation processes in the two media is proposed, thus expanding the basic knowledge of inelastic relaxation processes a Howing development of optimum hot electron-based THz mixers. The two most promising materials known at the present time, NbN films and 2DEG at heterostructures of GaAs/A1GaAs, have been singled out for specific comparison. ***